#define _CRT_SECURE_NO_WARNINGS 1


int missingNumber(int* nums, int numsSize) {
    int sum = 0;
    for (int i = 0; i <= numsSize; i++)
    {
        sum += i;
    }

    for (int i = 0; i < numsSize; i++)
    {
        sum -= nums[i];
    }
    return sum;
}
